Sewing-machine attachment.



P. GRIFFIN. SEWING MACHINE ATTACHMENT.

APPLICATION FILED'SEPT.15,1909.

WWE@ Patented June 7, 1910.

ANDREW n. GRAHAM 20, Pumormnusuwess,wnswNGran n r PATRICK GRIFFIN, OF SARON, TEXAS.

SEWING-MACHINE ATTACHMENT.

Specification of Letters Patent.

Patented June 7, 1910.

Application filed September 15, 1909. `Serial No. 517,870.

tachment may be readily applied and removed and employed for running an abrading or bu'lfing wheel or like rotary tool element.

The invention consists of the features of construction, combination and Aarrangement of parts hereinafter fully described and claimed, reference being had to the accompanying drawing, in which Figure 1 is a front elevation of a portion i of a sewing machine showing the application of the invention. Fig. 2 is a front to rear section on an enlarged scale through the worktable of the machine and parts of the attachment, showing the remaining parts of the attachment in side elevation. Fig. 3 is a top plan of a portion of the worktable and the attachment.

Referring to the drawing, the numeral 1 designates the worktable, 2 a portion of the frame, and 3 the main shaft of a sewing machine from which the sewing mechanism is operated, which shaft carries a fly wheel L and a pulley 5, the latter being engaged by the upper bight of the drive belt 6 which is driven from a pulley on the drive shaft below the worktable, the stretches 7 and 8 of which belt pass through openings 9 and 10 in the worktable.

My invention provides an attachment which may be mounted upon the worktable between the openings 9 and 10 and engaged with the walls of said Openings to hold it in position, such attachment being provided with a drive element operated by one of the stretches of the belt 6.

The attachment comprises a base plate 11 which is adapted to rest upon the worktable, as shown clearly in Figs. 2 and 3, alongside and in parallel relation to the opening 10, said plate being formed at one side with a cut away portion 12 to expose said opening and having a downwardly projecting clamping arm 13 to extend downward into said opening and bear against one side of the wall thereof. One end of said plate 11 is formed with an extension 11 over which laps one end of a clamping member 15, which end of said clamping member is formed with a longitudinal slot 16 for the passage of a clamping screw 17 carried by said extension 14. The opposite end of the member 15 is provided with a downturned spring clamping arm 18 designed to project downward into the opening S) and to engage one side of the wall thereof. llt will be understood by this construction that the baseplate 11 and clamping member 15 may be arranged in position upon the worktable between the stretches 7 and 8 of the belt and their respective arms passed downward into the openings and the device then clamped in position by relatively adjusting said inembers 11 and 15 to cause said arms to bind against the walls of the openings and then tightening the clamping screw 17 to secure the parts in adjusted position. Upon loosening the clamping screw, the parts 11 and 15 may be relatively moved outward and then disconnected from the worktable by withdrawing their clamping members from the openings.

Secured to the upper face of the member 11 are two transverse strips 19 and 20 having relatively inner beveled edges 21 forming a dove-tailed guideway for a supporting plate 22, the side edges of which are beveled or dove-tailed to engage said dove-tailed edges 21. This plate is also provided with a cut-away portion 23 to aline with the edge of the cut-away portion of the plate 11 and carries a forked supporting standard 24. the spaced arms of which carry at their upper ends a bearing sleeve 25. The forked bracket is arranged transversely of the supporting plate so as to bring` one of the ends of the sleeve 25 in line with one of the edges of the opening 10 when the device is applied to the machine, and journaled in said sleeve is a shaft 26 having ends projecting beyond the sleeve. The end of said shaft which projects beyond the end of the sleeve adjacent the opening 10 carries a pulley 27 grooved to receive and engage the stretch 8 of the belt 6, while the opposite end of the shaft carries a flange or collar 28 and a washer 29 between which is arranged the tool element 30,

shown in the present instance n the form of an emery wheel, buiing wheel or other similar type of rotary abrading or polishing member, which is clamped in position by a nut 2l on the end of the shaft and bearing against the washer 29. This mode ofmounting the tool element 30 permits different types of tool elements to be mounted on the shaft to adapt the attaclnnent for various uses. At or about its center the sleeve is formed with a hole or notch for convenience in lubricating the shaft.

From the foregoing` description of the construction and arrangement of the device, it will be understood that when the belt is in action motion will be connnunicated to the shaft 2G to rotate the tool elelnent 30, which may be employed for grinding, polishing and other purposes according to its character. It will also be seen that by simply releasing the clamping members in the manner described, the attachment as a whole may be quickly and conveniently removed from the machine. The base plate and its clamping member may, however, be left in position as a pernianent attachment, and the tool itself removed by simply sliding the supporting plate 2Q out of its dovetailed guideway. This mode of mounting the tool upon the base plate also permits other forms of tools mounted in a specifically different manner from that shown to be applied for use upon the machine.

The advantages and conveniences of my invention will be understood from the foregoing description.

Having thus described the invention what is claimed as new is:

l. An attaclnnent for sewing machines comprising a base plate, composed of two adjustably connected members, each of said members having a clamping arm, the clamping arm of one of the members being disposed at one side thereof and said latternamed member being' provided with a transverse dove-tailed guideway, a dove-tailed supporting plate engaging said guideway, and a pulley driving element carriedby said supporting plate.

2. A device of the character described comprising two adjustable connecting mem- A Y bers provided with clamping elements, one of said members having a dove-tailed guideway, a dove-tailed supporting plate adapted to engage said gnidevay, and tool supporting and driving means carried by said plate.

In testimony whereof I affix my signature in presence of two witnesses.

PATRICK GRIFFIN. Vitnesses J. D. VOOLFORD, J. D. SWEENEY. 

